# Stage 1: Builder
FROM golang:1.24.6-alpine AS builder

WORKDIR /app

# Copy go.mod and go.sum first to leverage Docker cache
COPY go.mod .
COPY go.sum .

# Download dependencies
RUN go mod download

# Copy the rest of the application source code
COPY . .

# Build the application
# CGO_ENABLED=0 is important for static linking, resulting in a smaller image
# -o manage-servers specifies the output binary name
RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o manage-servers .

# Stage 2: Runner
FROM alpine:latest

WORKDIR /root/

# Copy the compiled binary from the builder stage
COPY --from=builder /app/manage-servers .

# Copy the index.html file for the web server
COPY --from=builder /app/index.html .

# Copy the servers.json file
COPY servers.json .

# Expose the port the web server listens on
EXPOSE 8080

# Command to run the application
ENTRYPOINT ["./manage-servers", "serve"]